An odd one @Tfranks73
My guess is that there is some sort of rights management issue going on.
for a better answer you could contact the Skystore support team when they re open at 11am Monday.
https://www.skystore.com/n/hcus/help/contact-us
It wasn't on this particular movie but I recall reading that with older / not bought very often type movies, it isn't worth the streaming companies paying for distribution rights if they think it won't be popular enough. I'm only guessing on that point
I notice you can get hold of the DVD cheaply if you have a player.
